语音获取

要想发送语音信息，首先得获取语音，这里有几种方法，一种是使用DirectX的DirectXsound来录音，我为了简便使用一个开源的插件NAudio来实现语音录取。 在项目中引用NAudio.dll

//------------------录音相关----------------------------- private IWaveIn waveIn; private WaveFileWriter writer; private void LoadWasapiDevicesCombo() { var deviceEnum = new MMDeviceEnumerator(); var devices = deviceEnum.EnumerateAudioEndPoints(DataFlow.Capture, DeviceState.Active).ToList(); comboBox1.DataSource = devices; comboBox1.DisplayMember = "FriendlyName"; } private void CreateWaveInDevice() { waveIn = new WaveIn(); waveIn.WaveFormat = new WaveFormat(8000, 1); waveIn.DataAvailable += OnDataAvailable; waveIn.RecordingStopped += OnRecordingStopped; } void OnDataAvailable(object sender, WaveInEventArgs e) { if (this.InvokeRequired) { this.BeginInvoke(new EventHandler<WaveInEventArgs>(OnDataAvailable), sender, e); } else { writer.Write(e.Buffer, 0, e.BytesRecorded); int secondsRecorded = (int)(writer.Length / writer.WaveFormat.AverageBytesPerSecond); if (secondsRecorded >= 10)//最大10s { StopRecord(); } else { l_sound.Text = secondsRecorded + " s"; } } } void OnRecordingStopped(object sender, StoppedEventArgs e) { if (InvokeRequired) { BeginInvoke(new EventHandler<StoppedEventArgs>(OnRecordingStopped), sender, e); } else { FinalizeWaveFile(); } } void StopRecord() { AllChangeBtn(btn_luyin, true); AllChangeBtn(btn_stop, false); AllChangeBtn(btn_sendsound, true); AllChangeBtn(btn_play, true); //btn_luyin.Enabled = true; //btn_stop.Enabled = false; //btn_sendsound.Enabled = true; //btn_play.Enabled = true; if (waveIn != null) waveIn.StopRecording(); //Cleanup(); } private void Cleanup() { if (waveIn != null) { waveIn.Dispose(); waveIn = null; } FinalizeWaveFile(); } private void FinalizeWaveFile() { if (writer != null) { writer.Dispose(); writer = null; } } //开始录音 private void btn_luyin_Click(object sender, EventArgs e) { btn_stop.Enabled = true; btn_luyin.Enabled = false; if (waveIn == null) { CreateWaveInDevice(); } if (File.Exists(soundfile)) { File.Delete(soundfile); } writer = new WaveFileWriter(soundfile, waveIn.WaveFormat); waveIn.StartRecording(); }

上面的代码实现了录音，并且写入文件p2psound_A.wav

语音发送

获取到语音后我们要把语音发送出去

当我们录好音后点击发送，这部分相关代码是

MsgTranslator tran = null; ublic Form1() { InitializeComponent(); LoadWasapiDevicesCombo();//显示音频设备 Config cfg = SeiClient.GetDefaultConfig(); cfg.Port = 7777; UDPThread udp = new UDPThread(cfg); tran = new MsgTranslator(udp, cfg); tran.MessageReceived += tran_MessageReceived; tran.Debuged += new EventHandler<DebugEventArgs>(tran_Debuged); } private void btn_sendsound_Click(object sender, EventArgs e) { if (t_ip.Text == "") { MessageBox.Show("请输入ip"); return; } if (t_port.Text == "") { MessageBox.Show("请输入端口号"); return; } string ip = t_ip.Text; int port = int.Parse(t_port.Text); string nick = t_nick.Text; string msg = "语音消息"; IPEndPoint remote = new IPEndPoint(IPAddress.Parse(ip), port); Msg m = new Msg(remote, "zz", nick, Commands.SendMsg, msg, "Come From A"); m.IsRequireReceive = true; m.ExtendMessageBytes = FileContent(soundfile); m.PackageNo = Msg.GetRandomNumber(); m.Type = Consts.MESSAGE_BINARY; tran.Send(m); } private byte[] FileContent(string fileName) { FileStream fs = new FileStream(fileName, FileMode.Open, FileAccess.Read); try { byte[] buffur = new byte[fs.Length]; fs.Read(buffur, 0, (int)fs.Length); return buffur; } catch (Exception ex) { return null; } finally { if (fs != null) { //关闭资源 fs.Close(); } } }

如此一来我们就把产生的语音文件发送出去了

语音的接收与播放

其实语音的接收和文本消息的接收没有什么不同，只不过语音发送的时候是以二进制发送的，因此我们在收到语音后 就应该写入到一个文件里面去，接收完成后，播放这段语音就行了。

下面这段代码主要是把收到的数据保存到文件中去，这个函数式我的NetFrame里收到消息时所触发的事件，在文章前面提过的那篇文章里

void tran_MessageReceived(object sender, MessageEventArgs e) { Msg msg = e.msg; if (msg.Type == Consts.MESSAGE_BINARY) { string m = msg.Type + "->" + msg.UserName + "发来二进制消息!"; AddServerMessage(m); if (File.Exists(recive_soundfile)) { File.Delete(recive_soundfile); } FileStream fs = new FileStream(recive_soundfile, FileMode.Create, FileAccess.Write); fs.Write(msg.ExtendMessageBytes, 0, msg.ExtendMessageBytes.Length); fs.Close(); //play_sound(recive_soundfile); ChangeBtn(true); } else { string m = msg.Type + "->" + msg.UserName + "说:" + msg.NormalMsg; AddServerMessage(m); } }

收到语音消息后，我们要进行播放，播放时仍然用刚才那个插件播放

//--------播放部分---------- private IWavePlayer wavePlayer; private WaveStream reader; public void play_sound(string filename) { if (wavePlayer != null) { wavePlayer.Dispose(); wavePlayer = null; } if (reader != null) { reader.Dispose(); } reader = new MediaFoundationReader(filename, new MediaFoundationReader.MediaFoundationReaderSettings() { SingleReaderObject = true }); if (wavePlayer == null) { wavePlayer = new WaveOut(); wavePlayer.PlaybackStopped += WavePlayerOnPlaybackStopped; wavePlayer.Init(reader); } wavePlayer.Play(); } private void WavePlayerOnPlaybackStopped(object sender, StoppedEventArgs stoppedEventArgs) { if (stoppedEventArgs.Exception != null) { MessageBox.Show(stoppedEventArgs.Exception.Message); } if (wavePlayer != null) { wavePlayer.Stop(); } btn_luyin.Enabled = true; }private void btn_play_Click(object sender, EventArgs e) { btn_luyin.Enabled = false; play_sound(soundfile); }

在上面演示了接收和发送一段语音消息的界面

技术总结

主要用到的技术就是UDP和NAudio的录音和播放功能

希望这篇文章能够给大家提供一个思路，帮助大家实现P2P语音聊天工具。